The capture of particles in the ambient air is the basis for the prevention and control of atmospheric particulate pollution．Based on the theory of wet trapping，a new set of wet trapping devices for atmospheric fine particulate matter is designed and built． The device is used to conduct on-site sampling experiments on atmospheric particles，and the obtained particle sample solution is tested by dynamic light scattering technology．The concentration of the sample is characterized by the number of scattered light photons of the sample solution．The experimental results show that the device built can effectively capture atmospheric fine

particle samples．The capture efficiency increases with the increase of rotor speed，and firstly increases and then decreases with the increase of liquid flow rate．When the liquid flow rate is 600 mL/min，the device has the best capture performance．